eo-an-i byeong-byeong-ha-da
to be dumbfounded, to be flabbergasted
phrase
갑작스러운 소식에 어안이 벙벙했어.
I was dumbfounded by the sudden news.
그 말을 들으니 어안이 벙벙해요.
I'm speechless hearing that.
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